Apparatus for placing protective covering around pipes



Oct. 24, 1939. c. H. MULL 2,177,221

APPARATUS FOR PLACING PROTECTIVE COVERING AROUND PIPES Filed Oct. 12, 1957 3 Sheets-Sheet l Inventor U f/ Mu g unwm A iforneys Oct. 24, 1939. v c. H. MULL 2,177.22]

APPARATUS FOR PLACING PROTECTIVE COVERING AROUND PIPES Filed Oct. 12, 1937 3 Sheets-Sheet 2 1 1 l I I 5 I 23 ll l l I I I I l l I l I D I [ll l 27 ll l ll l l l 1 I I Q 1. Q Q 7 o 9 L\I\\\\\\\\\\\\\\ l 2/ 72 ?6 2i 2 A A 0 a l l I 0a; 24, 1939. c, N LL 2,177,221

APPARATUS FOR PLACING PROTECTIVE COVERING AROUND PIPES I Filed 001. 12, 1937 s Sheets-Sheet s A iiomeg s Patented Oct. 24, 1939 UNITED STATES PATENT F F ICE .-.AP.PARATUS ;FOR PLACING PROTECTIVE covEmNc AROUND PIPES 2 Claims.

Thisinvention is :an apparatus for applying .to, or placing around pipes a protective covering :of cementitious material, and particularly a .pro- -t'ective covering of .reinforced concrete.

.An object .of this inventionis to provide an apparatus whereby the .covering of pipes with concrete or analogous .cementitious material may beaccomplishedin a quick, efficient, practical manner.

The invention, .together with its objects and advantages, will .be best .understood ;from a study -.of the following descriptiontaken in connection with the accompanying drawings, wherein:

Figure l is an elevational view illustrating the application of the apparatus and with parts broken away .andshown in section.

:Figure '2 is a longitudinal sectional view through a form forming part of the apparatus and'further illustrating the-application of the invention.

:FigureB-is an elevational view of one end of the form.

Figure 4iis aperspective view of a retaining annulus or plate.

Figure 5 is an edge elevational view of a gasket with certain parts broken away and shown in section.

Figure 6 is a fragmentary sectional view through the form in the region of the filling neck of the form.

Figure 7 is a fragmentary detail sectional view showing the joints formed between adjacent sections of the pipe covering.

Figure 8 is a fragmentary detail sectional view illustrating the application of a second form also forming part of the invention.

Referring to the drawings more in detail it will be seen that in the preferred embodiment thereof the invention comprises a pair of forms, 5, 5a, respectively, and each of said forms consists of a pair of elongated semi-cylindrical members, formed of metal or the like, and provided at their longitudinal meeting edges with outstanding flanges 6 whereby through the medium of U-shaped clips I and wedges 8 the sections of the tubular form are secured about and concentric to the pipe 9 to which the covering is to be applied.

The top section of each form, intermediate its ends, is provided with. a filling or intake neck ID that accommodates the lower end of a flexible tube II that extends from the outlet l2 of a hopper or charging chamber I3.

The hopper or charging chamber I3 is adapted to receive the. concrete to be used in covering the pipe 9 and is provided at .its top with a :charging neck 14 for'whicha closure valve I5 is provided.

The charging :hopper -.or chamber I3 is also provided with a lateral compressed air inlet Hi to which issuitably connecteda conduit I1 lead- .ing from a suitable source of compressed (air.

Between the inlet l6'and conduit I'l there is :provided .a control valve ,18.

The outlet l2 of the hopper or chamber I3 is aalsozprovided with a manually operable control -;valve 19 of any suitable construction.

Also, tapped into the flexible conduit II is one end .of .a conduit 20 which leads from a suitable source of compressed air, whereby air under pressure may be utilized forplacing the concrete withinrthe form under pressure.

,At the end thereofythe sections of the form 5 are provided with inwardly directed lugs 2| that serve to retain within said ends of the form :5 annular closure plates 22, each of which is :divided into apair ofcomplemental half-sections ;,as shown .;in Figure 4. Also disposed'within each vend of the "form 5 and abuttting the adjacent plate 22 is an annular gasket 23 of rubber, and at its outer edge the gasket 23 is provided with an annular flange 24 that fits against the inner surface of the form 5 as shown in Figure 2.

In using the device the reinforced concrete covering 25 for the pipe 9 is applied in sections, the apparatus described being successively used in the forming and applying of each successive section of the covering 25.

In using the apparatus, form 5 is successively used in forming alternate covering sections 25 while form 511 is successively used for forming intermediate forms 25a as will presently appear. Thus, the form 5 is first secured about the pipe 9 with the elements 22, 23 arranged within the respective opposite ends of the form and the reinforcing wires 26 located within the form and extending from one end to the other thereof between the elements 23, the reinforcing wires being disposed in a circular series about the pipe 9.

The concrete or other material to be used in making the reinforced covering 25 is placed in the hopper l3 and with valve l3 open air under pressure is introduced into the hopper l3 for forcing the concrete contents of the hopper through the open valve 9 of the conduit ll into the form 5 to fill the space between the walls of the form and the pipe 9, with the reinforcing rods 26 becoming imbedded in the concrete, as is obvious. At the same time, air under pressure is also admitted into the form through the conduit II and from the conduit 20 for placing the concrete under pressure as it is filling up the form 5 about the pipe 9.

In connection with the above, it will be noted that through the medium of the flange-equipped gasket 23 the section of the reinforced covering thus formed will be provided at each end thereof with a reduced extension 21 as and for a purpose hereinafter made manifest.

After one reinforced concrete cover section 25 has been formed in this manner the form 5 is removed from about the cover section thus' formed and then repositioned about the pipe 9 at a point suitably spaced from the thus formed cover section 25 for the purpose of forming, in

identically the same manner, a second cover section 25.

After two sections 25 of the reinforced covering has been formed in this manner, resort is had to form 5a and this form is then placed aboutthe portion of the pipe Sintermediate the confronting ends of the previously formed cover sections 25 for the purpose of forming an intermediate reinforced concrete covering section 25a. Thus referring to Figure 8 it Will be seen that the form 5a is so positioned as to bridge the space between the confronting ends of the-cover sections 25a with said ends of the cover sections 25a extending inwardly of the form 5a and the reinforcing rods arranged in a circular series about the pipe 9 with the ends of-the rods resting on the reduced portions 21 0f the cover sections The filling neck IU of form 5a is thenconnected with the hose or conduit H extending from the hopper l3.

The concrete is then fed-into the form 5a in a manner previously described and some of the concrete will flowaround the confronting reduced ends 21 of the previously cast concrete cover sections 25, thus forming, as it were, at the ends of the second section 25a of covering internal grooves or recesses 28 that receive the extensions 21 of the cover sections 25 whereby,

fthe construction, utility, and advantages of an apparatus of this character will be had without a more detailed description.

Having thus described the invention, what is claimed as new is:

1; A mold filling device comprising a vertically arranged hopper having a tapered lower portion terminating in a discharge neck, a filling neck at the upper end of the hopper, valves for controlling said necks, means .for connecting an air pressure supply to the upper portion of the hopper for forcing material from the latter by way of said discharge neck and includinga control valve, a flexible pipe connected to the discharge neck for directingthe discharged material into a. mold, and means for connecting said flexible pipe to the air pressure supply for driving the discharged material into the mold under pressure to bring about packing and complete filling of the mold with the material.

2. A mold'filling device comprising a vertically arranged hopper having a tapered lower portion terminating in a discharge neck, a filling neck at the upper end of the. hopper, valves for controlling said necks, a flexible pipe connected to the discharge neck for directing material from the hopper into a mold, and means for connecting,

an air pressure supply to the upper portion of the hopper for forcing material from the latter" by way of said discharge neck and including a control valve.

, CHARLES H. MULL. 

